81870304 has 24 divisors (see below), whose sum is σ = 162093960. Its totient is φ = 40703616.

The previous prime is 81870293. The next prime is 81870311. The reversal of 81870304 is 40307818.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1419 + ... + 12874.

It is an arithmetic number, because the mean of its divisors is an integer number (6753915).

Almost surely, 2^81870304 is an apocalyptic number.

It is an amenable number.

81870304 is a deficient number, since it is larger than the sum of its proper divisors (80223656).

81870304 is a wasteful number, since it uses less digits than its factorization.

81870304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14482 (or 14474 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 81870304 is about 9048.2210406245. The cubic root of 81870304 is about 434.2189781703.

The spelling of 81870304 in words is "eighty-one million, eight hundred seventy thousand, three hundred four".